Alexander leslie fyfe and john main



(No Model.)

A. L. PYFE & J. MAIN.

BLBOTRIQ ARG LAMP. No. 328,022. Patented Oct. 13,

a4 fie/Sb; Inventor. M; 9 (2 2 UNITED STATES PATENT OFFICE.

ALEXANDER LESLIE FYFE AND JOHN MAIN, OF BRIXTON, COUNTY OF SURREY, ENGLAND.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No.328,022, dated October 13, 1885.

Application filed August 21, 1883. Serial No. 104,283. (No model.) Patented in England September 2, 1881, No. 3,821, and in Germany April 18, 1882, No. 22,292.

To all whom it may concern.-

Be it known that we, ALEXANDER LEsLIE FYFE and JOHN MAIN, subjects of the Queen of Great Britain, residing at Brixton, in the county of Surrey, England, have invented certain new and useful Improvements in Electric- Arc Lamps, (for which we have received Letters Patent in Great Britain, No. 3,821, dated September 2,1881,(of which the following is a specification.

This invention has for its object improve ments in electric-arc lamps; and it consists in mechanism actuated by the electric current, whereby the voltaic are and the feed of the carbons are automatically maintained uniform.

In the accompanying drawings, Figure 1 is a front elevation of the mechanism of alamp,

, and Fig. 2 an end elevation thereof. Fig. 3 is its highest position.

apart elevation of the back side of the lamp, showing the lowest position of the gearingframe. Fig. 4 is a part elevation of the front side of the lamp, showing the gearing-frame in Fig. 5 is a perspective View of the fiy-wheel. Figs. 6 and 7 are vertical sections through the cylinder with the fly-wheel. Fig. Sis a half end view of said cylinder.

Our invention will be best understood with reference to the drawings, where similar letters of reference indicate corresponding parts.

The current is directed to the lamp-case A, and that of the opposite polarity by the lead B to the electro-niagnet O. The purpose of the electro-magnet O is to establish the are by attracting the armature O, secured to the lever D, which is pivoted at E, to the bracket E, and the opposite end, D, engages with the gearing-frame F. This gearing-frame is raised Vertically by the attraction of the armature O to the electro-magnet O, opposite the fulcrum. The'gearing-frame F contains a solenoid, G, a brake, H, and a train of wheels. The first wheel, a, of the train of wheels gears into the rack formed on the one side of the carbonholder J. The wheel a drives the pinion b, on whose axis is keyed a ratchet-wheel, 0, while mounted freely on the axis is a toothed wheel, (I, which carries a pawl, c, and a spring, f, bearing on said pawl e, to cause the same to engage with the teeth of the ratchetwheel c,

by the adaption of which the carbon-holder J can be raised to insert a new carbon without rotating the wheels. The toothed wheel (2 of the train engages with the pinion g, and the spur-wheel h engages with the pinion t. On its axis is mounted a flywheel, j, having a smooth periphery,which being the last of the train revolves at a very high velocity by reason of the descent of the carbon-holder J.

The solenoid G, before referred to, is in a shunt-circuit. One end of the wire is connected to the coupling is of thelead B, and before being coupled to the said solenoid G it is connected to the high resistance coil K, so that when the resistance of the are exceeds that of the electro-magnet O and the resistancecoil K, sufficient current will pass through to excite the solenoid G and so release the brake II, and the carbonholder J will descend by its own weight and feed the carbons until the resistance of the arc is again less than that of the shunt-circuit, then the solenoid G will be inactive and the brake H be applied to the periphery of the fly-wheel j. In the normal position of the armature O and gearing-frame F, when little or no current is passing through the lamp, the projecting part II of the brake I-I makes contact with an adjustable stop, 7H, and the brake H is raised from the periphery of the fly-wheel j. The short end D of the armaturelever D carries a small truck, D, which bears against the underside of the block D secured on the gearing-frame in order to lessen the frictionwhen the gearing-frame F is being raised, and by the attraction to the electro-magnet O of the armature C, the one end H of the brake is raised from contact with the stop 70*, and the brake H thereby caused to bear on the periphery of the flywheel j. Fig. 3 is a part elevation of the 0pposite side of the lamp with the gearing-frame F in the normal position and the detent H in contact with the stop 75 The brake H and detent H are made out of one piece of flat metal and pivoted at H, and J position shown at Fig". 4. In this figure the gearing-frame is shown raised or in the work ing position and the are established. The core G of the solenoidG is provided with an opening, Z, on the one side, which embraces the de tent portion H of the brake H, so as to raise it to the position assumed when part of the current is passing through the solenoid G, whereby the feed of the carbons is effected.

In order to obviate a too sudden feed,we propose to further control the rotation of the train of wheels, in addition to the brake H, by applying a governor on the fly-wheel j, as shown in Figs. 5, 6, and 7. Fig. oisaperspective view of the iiy-wheelj, provided with very light governing-arms j, which carry at their ends each asmall governor j These arms j revolve within a cylinder, m. (Shown in section at Figs. 6 and 7, and in 11alfend elevation at Fig.8.) \Vhen the gearingis not rotating,these armsj assume the position shown at Fig. 6, but when the fly-wheelj and its arm 3" are revolving, when .the brake H is released, then by centrifugal action the free endsj of the arm 25 j will descend from the horizontal line and rub on the interior surface of the cylinder on during its revolution, and so retard to the desired extent the rotation of the train of wheels. It will thus be seen that the disadvantages of too great a speed of theflywheel, andaquiok feed of the carbons is obviated.

I am well aware that governors in shape of flywheels with centrifugal arms rubbing against the inside periphery of a friction-cylinder have already been in use in telegraph apparatus, and I hereby disclaim the same; but

XVhat I claim is In electric-arc lamps, in combination, the electromagnet 0, within the main circuit operating the armature O on end of the fulcrumed lever D D, said lever engaging, by means of truck D", the gearing-frame F, the train of wheels ab dgz' mounted therein, with the fiy-wheel j and ratchet-wheel c,with pawl e and spring f, the fly-wheel with centrifugal arms j jfljj" rubbing against inside of frictioneylinder at, said fly-wheel with frictional periphery, against which bears the brake II, which is operated by detent H and core G of solenoid G, said solenoid attached to gearing-frame and inserted together with the re sislance-coil K within ashunt-cireuit, all substantially as shown and described, and for the purpose to operate as set forth.

A. L. FYFE. JOHN MAIN.

\Vitnesses: I

CHAS. BERKLEY Hhnnis, J. WATT,

Both of 17 Gracechzu'chStreet, London. 

